National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

81°F

27°C

Humidity 74%
Wind Speed S 8 mph
Barometer 30.10 in (1018.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 18 Aug 12:56 am CDT
Extended Forecast for

Lockhart TX

  • Overnight

    Overnight: Mostly clear, with a low around 75. South wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 101. Heat index values as high as 106. Calm wind becoming south around 5 mph in the afternoon.

    High: 101 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 77. South wind 5 to 10 mph.

    Low: 77 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 101. Heat index values as high as 104. South southwest wind 5 to 10 mph.

    High: 101 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 102. South wind around 5 mph.

    High: 102 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny and hot, with a high near 102. South southwest wind around 5 mph.

    High: 102 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 78. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 75. South wind around 5 mph.
Tuesday
Mostly sunny and hot, with a high near 101. Heat index values as high as 106. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 77. South wind 5 to 10 mph.
Wednesday
Mostly sunny and hot, with a high near 101. Heat index values as high as 104. South southwest wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny and hot, with a high near 102. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 77. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Mostly sunny and hot, with a high near 102. South southwest wind around 5 mph.
Friday Night
Mostly clear, with a low around 78. Southeast wind around 5 mph becoming south southwest after midnight.
Saturday
Mostly sunny and hot, with a high near 103.
Saturday Night
Mostly clear, with a low around 78.
Sunday
Sunny and hot, with a high near 103.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny and hot, with a high near 102.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
1:24 am CDT Aug 18, 2026
Forecast Valid:
1am CDT Aug 18, 2026-6pm CDT Aug 24, 2026
 
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Additional Resources

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Chance of Precipitation